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How to Replace a Lock on a UPVC Door in Five Minutes It's a simple and inexpensive project to change the lock on your Upvc door. It can be accomplished in just five minutes. This is an excellent option to enhance the security of your home, whether you're replacing a lock in the aftermath of an attack, or just need to increase security. 1. Remove the lock from the old one. The first step to change a lock on upvc doors is to take off the lock that was previously in use. It may seem difficult at first, howev